Yeah sometimes you will find a few with a wing sticking out more than usual, but it doesnt get corrected. It also doesnt affect flying, at least it doesnt with mine?
Curved wings can occur from molting in a bad place, once the wings start to expand, they dont stop. So if the roach has the soft wings touching the ground bending, they will continue to grow bent and harden that way forever. If bending occurs right at the start of the molt and the roach moves to a better area, the wings still have a chance to expand and be normal.